3 files changed, 54 insertions, 6 deletions

diff --git a/ezjail-admin b/ezjail-admin
index 418c89d..5f7fcdc 100755
--- a/ezjail-admin
+++ b/ezjail-admin
@@ -47,7 +47,7 @@ ezjail_usage_ezjailadmin="${ezjail_admin} v3.1.1b\nUsage: ${ezjail_admin} [archi
 ezjail_usage_install="Usage: ${ezjail_admin} install [-mMpPsS] [-h host] [-r release]"
 ezjail_usage_create="Usage: ${ezjail_admin} create [-xbi] [-f flavour] [-r jailroot] [-s size] [-c bde|eli|zfs] [-C args] [-a archive] jailname jailip"
 ezjail_usage_delete="Usage: ${ezjail_admin} delete [-wf] jailname"
-ezjail_usage_update="Usage: ${ezjail_admin} update [-s sourcetree] [-p] (-b|-i|-u|-P)"
+ezjail_usage_update="Usage: ${ezjail_admin} update [-s sourcetree|sourceosversion] [-p] (-b|-i|-u|-U|-P)"
 ezjail_usage_config="Usage: ${ezjail_admin} config [-r run|norun] [-n newname] [-c cpuset] [-z zfs-datasets] [-f fib] [-i attach|detach|fsck] jailname"
 ezjail_usage_console="Usage: ${ezjail_admin} console [-f] [-e command] jailname"
 ezjail_usage_archive="Usage: ${ezjail_admin} archive [-Af] [-a archive] [-d archivedir] jailname [jailname...]"
@@ -837,12 +837,13 @@ list)
 ######################## ezjail-admin UPDATE ########################
 setup|update)
   # Clean variables, prevent polution
-  unset ezjail_provideports ezjail_installaction
+  unset ezjail_provideports ezjail_installaction ezjail_osversion_source ezjail_osversion_destination
 
   shift; while getopts :biupPs: arg; do case ${arg} in
     b) ezjail_installaction="buildworld installworld";;
     i) ezjail_installaction="installworld";;
     u) ezjail_installaction="freebsd-update";;
+    U) ezjail_installaction="freebsd-upgrade";;
     s) ezjail_sourcetree=${OPTARG};;
     P) ezjail_provideports="YES"; ezjail_installaction="none";;
     p) ezjail_provideports="YES";;
@@ -870,6 +871,22 @@ setup|update)
     [ -z "$TERM" -o "$TERM" = "dumb" ] && ezjail_urgency="cron" || ezjail_urgency="fetch"
     [ "${ezjail_use_zfs}" = "YES" ] && zfs snapshot ${ezjail_jailzfs}/basejail@`date -v -7d +"%C%y%m%d_%H:%M:%S"`
     freebsd-update -b ${ezjail_jailbase} ${ezjail_urgency} install
+  elif [ "${ezjail_installaction}" == "freebsd-upgrade" ]; then
+    [ -d "${ezjail_jailbase}" ] || exerr "Error: base jail does not exist.\n  You cannot update a base jail until it is created.\n  Please run '${ezjail_admin} update' or '${ezjail_admin} install' first."
+
+    [ -z "${ezjail_sourcetree}" ] && exerr "Error: Can not (yet automatically) infer the basejail's osversion.\n  Please run ${ezjail_admin} update -U -s X.X-RELEASE, with X.X-RELEASE being to osversion currently installed in the basejail in need of an upgrade."
+
+    # That would be the part where we try to lookup the osversion from a file in the basejail
+    ezjail_osversion_source="${ezjail_sourcetree}"
+
+    # Make the host systems os version our target version
+    # Users can override this by setting the UNAME_r environment variable
+    ezjail_osversion_target="`uname -r`"
+
+    # Finally run freebsd-update to upgrade our basejail
+    env UNAME_r="${ezjail_osversion_source}" freebsd-update -b ${ezjail_jailbase} -r ${ezjail_osversion_target} upgrade install
+
+    # Here we should write the file with the new osversion in case of success
   else
     # Bump the user for some of the most common errors
     [ -d "${ezjail_sourcetree}" ] || exerr "Error: Cannot find your copy of the FreeBSD source tree in ${ezjail_sourcetree}.\n  Consider using '${ezjail_admin} install' to create the base jail from an ftp server."
diff --git a/man7/ezjail.7 b/man7/ezjail.7
index cef662c..adf9eb0 100644
--- a/man7/ezjail.7
+++ b/man7/ezjail.7
@@ -566,6 +566,18 @@ Update the base jail to the next release using
 .Xr freebsd-update 8
 (i.e. using binary packages). This may be used only to update an
 existing installation.
+.It Nm Cm update Fl U s Ar 8.0-RELEASE
+Upgrade the base jail to the host system's release using
+.Xr freebsd-update 8 . This may be used only to upgrade an
+existing installation. Tell freebsd-update which OS version to expect
+in the basejail via the
+.Fl s No option.
+.Pp
+Note: Check
+.Xr uname 1
+and especially the
+.Pa UNAME_r
+environment variable to upgrade to different versions.
 .El
 .Ss Jail Creation Examples
 .Bl -tag -width indent
diff --git a/man8/ezjail-admin.8 b/man8/ezjail-admin.8
index 9af6866..250cd7e 100644
--- a/man8/ezjail-admin.8
+++ b/man8/ezjail-admin.8
@@ -54,9 +54,9 @@
 .Ar archive | jailname...
 .Nm
 .Cm update
-.Op Fl s Ar sourcetree
+.Op Fl s Ar sourcetree | sourceosversion
 .Op Fl p
-.Fl b | Fl i | Fl P | Fl u
+.Fl b | Fl i | Fl P | Fl u | Fl U
 .Sh DESCRIPTION
 The
 .Nm
@@ -535,6 +535,19 @@ uses
 to determine the currently running system, the base jail and the host
 need to be updated at the same time, without rebooting on the new
 kernel in the meantime.
+.It Fl U
+Use
+.Xr freebsd-update 8
+to upgrade the basejail to the hosts operating system version, or a version
+you may pass freebsd-update's call to
+.Dq uname -r
+via the
+.Pa UNAME_r
+environment variable. Since there currently is no way of infering the
+osversion currently installed in the basejail, you need to remember the
+original osversion and pass it to this script using the
+.Fl s
+option.
 .It Fl P
 Install only the ports tree, assuming the basejail has already been
 created. This can be done while jails are running. The
@@ -548,13 +561,19 @@ The following options are available:
 Give the new basejail a copy of FreeBSD's ports tree. The
 .Xr portsnap 8
 utility is invoked to do the actual work.
-.It Fl s Ar sourcedir
-Use the sources in
+.It Fl s Ar sourcedir | sourceosversion
+In the
+.Fl b No and Fl i No case: Use the sources in
 .Ar sourcedir
 instead of
 .Pa /usr/src .
 Variable:
 .Dq Li $ezjail_sourcetree .
+.Pp
+In the
+.Fl U No case: Pass this release tag to
+.Xr freebsd-update 8
+as the source OS version of the basejail.
 .El
 .Pp
 See the